Citigroup Inc.

This is the Citi that never sleeps. One of the largest financial services firms known to man, Citigroup (also known as Citi) has some 200 million customer accounts and serves clients around the globe. It offers deposits and loans (mainly through Citibank), investment banking, brokerage, wealth management, and other financial services. Trading in more than 160 countries and with approximately 142 million Citi-branded credit cards in circulation worldwide , few other banks can equal Citigroup's global reach. Hit hard by the 2008 financial crisis, Citi has been refocusing on its original mission -- traditional banking. Citi has some $1.9 trillion in assets and some $1 trillion in deposits. Citigroup generates some 45% of its sales from North America.